Rather than editing three scripts every time I install Microsoft Deployment, I've created this ZIP file that you can extract into "C:\Program Files" or wherever you have installed the Microsoft Deployment package. You should be asked to overwrite three files when extracting, and you should say "Yes". The original files are renamed with ".orig" at the end if you want to compare the before and after.

If you are not asked to overwrite files, you are probably extracting the ZIP file into the wrong location.

Update - 12-17-2007: I've updated the ZIP file to include the third fix mentioned here.